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  <span class="target" id="memoryview-objects"></span><div class="section" id="index-0">
<span id="id1"></span><h1>MemoryView 对象<a class="headerlink" href="#index-0" title="永久链接至标题">¶</a></h1>
<p>一个 <a class="reference internal" href="../library/stdtypes.html#memoryview" title="memoryview"><code class="xref py py-class docutils literal notranslate"><span class="pre">memoryview</span></code></a> 对象C级别的 <a class="reference internal" href="buffer.html#bufferobjects"><span class="std std-ref">缓冲区接口</span></a> 暴露为一个可以像任何其他对象一样传递的 Python 对象。</p>
<dl class="function">
<dt id="c.PyMemoryView_FromObject">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *<code class="sig-name descname">PyMemoryView_FromObject</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *obj</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMemoryView_FromObject" title="永久链接至目标">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>从提供缓冲区接口的对象创建 memoryview 对象。 如果 <em>obj</em> 支持可写缓冲区导出，则 memoryview 对象将可以被读/写，否则它可能是只读的，也可以是导出器自行决定的读/写。</p>
</dd></dl>

<dl class="function">
<dt id="c.PyMemoryView_FromMemory">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *<code class="sig-name descname">PyMemoryView_FromMemory</code><span class="sig-paren">(</span>char<em> *mem</em>, Py_ssize_t<em> size</em>, int<em> flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMemoryView_FromMemory" title="永久链接至目标">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>使用 <em>mem</em> 作为底层缓冲区创建一个 memoryview 对象。 <em>flags</em> 可以是 <code class="xref c c-macro docutils literal notranslate"><span class="pre">PyBUF_READ</span></code> 或者 <code class="xref c c-macro docutils literal notranslate"><span class="pre">PyBUF_WRITE</span></code> 之一.</p>
<div class="versionadded">
<p><span class="versionmodified added">3.3 新版功能.</span></p>
</div>
</dd></dl>

<dl class="function">
<dt id="c.PyMemoryView_FromBuffer">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *<code class="sig-name descname">PyMemoryView_FromBuffer</code><span class="sig-paren">(</span><a class="reference internal" href="buffer.html#c.Py_buffer" title="Py_buffer">Py_buffer</a><em> *view</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMemoryView_FromBuffer" title="永久链接至目标">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>创建一个包含给定缓冲区结构 <em>view</em> 的 memoryview 对象。 对于简单的字节缓冲区，<a class="reference internal" href="#c.PyMemoryView_FromMemory" title="PyMemoryView_FromMemory"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyMemoryView_FromMemory()</span></code></a> 是首选函数。</p>
</dd></dl>

<dl class="function">
<dt id="c.PyMemoryView_GetContiguous">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *<code class="sig-name descname">PyMemoryView_GetContiguous</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *obj</em>, int<em> buffertype</em>, char<em> order</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMemoryView_GetContiguous" title="永久链接至目标">¶</a></dt>
<dd><em class="refcount">Return value: New reference.</em><p>从定义缓冲区接口的对象创建一个 memoryview 对象 <a class="reference internal" href="../glossary.html#term-contiguous"><span class="xref std std-term">contiguous</span></a> 内存块（在 'C' 或 'F'ortran <em>order</em> 中）。 如果内存是连续的，则 memoryview 对象指向原始内存。 否则，复制并且 memoryview 指向新的 bytes 对象。</p>
</dd></dl>

<dl class="function">
<dt id="c.PyMemoryView_Check">
int <code class="sig-name descname">PyMemoryView_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *obj</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMemoryView_Check" title="永久链接至目标">¶</a></dt>
<dd><p>如果对象 <em>obj</em> 是 memoryview 对象，则返回 true 。 目前不允许创建 <a class="reference internal" href="../library/stdtypes.html#memoryview" title="memoryview"><code class="xref py py-class docutils literal notranslate"><span class="pre">memoryview</span></code></a> 的子类。</p>
</dd></dl>

<dl class="function">
<dt id="c.PyMemoryView_GET_BUFFER">
<a class="reference internal" href="buffer.html#c.Py_buffer" title="Py_buffer">Py_buffer</a> *<code class="sig-name descname">PyMemoryView_GET_BUFFER</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *mview</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMemoryView_GET_BUFFER" title="永久链接至目标">¶</a></dt>
<dd><p>返回指向 memoryview 的导出缓冲区私有副本的指针。 <em>mview</em> <strong>必须</strong> 是一个 memoryview 实例；这个宏不检查它的类型，你必须自己检查，否则你将面临崩溃风险。</p>
</dd></dl>

<dl class="function">
<dt id="c.PyMemoryView_GET_BASE">
<a class="reference internal" href="buffer.html#c.Py_buffer" title="Py_buffer">Py_buffer</a> *<code class="sig-name descname">PyMemoryView_GET_BASE</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *mview</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyMemoryView_GET_BASE" title="永久链接至目标">¶</a></dt>
<dd><p>返回 memoryview 所基于的导出对象的指针，或者如果 memoryview 已由函数 <a class="reference internal" href="#c.PyMemoryView_FromMemory" title="PyMemoryView_FromMemory"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyMemoryView_FromMemory()</span></code></a> 或 <a class="reference internal" href="#c.PyMemoryView_FromBuffer" title="PyMemoryView_FromBuffer"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyMemoryView_FromBuffer()</span></code></a> 创建则返回 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>。 <em>mview</em> <strong>必须</strong> 是一个 memoryview 实例。</p>
</dd></dl>

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